I bought a Joying 9inch headunit to upgrade to a screen for google maps, apple carplay, etc etc. I thought it would be plug and play with the APP070 iso harness but it turns out the previous owner removed the mating plug from the car and hardwired the previous headunit. So what i've done is stripped the wire from the APP070 harness to allow me to hardwire it to the car. I'm pretty confident i've matched the colour coding of the wires, but just wanted to double check with everyone here that if I wire the new headunit in accordance with the colour coding of the previous headunit, would it be fine?

Wire from the APP070 iso harness which is connected to the harness the new headunit came with

Wire from the car

 

WHY DID YOU CUT THE STOCK WIRE HARNESS? That's your issue to begin with. A radio harness is like $10 at WALMART....smh.

 

The previous owner cut the plug off according to the OP... my suggestion would be to go to a junkyard and cut off an original radio harness plug (with 6" or so of the wiring) from a vehicle of the same year and model as you have. This should have the same wire colors as what you see in the radio opening of your car and you can simply match the wires color by color.

 

I would just look up the factory radio wiring in the FSM. It will have each wire color labeled. Then look up the color coding for the wires for the head unit you have and match em up.

Or, you could grab one of these Metra harnesses. Splice the loose end into the factory wiring, cut the plug off, and splice that end into the head unit you have. The metra harnesses have labels for each wire and it's likely the same color wires as the factory harness. Again, you'll want to look up the wiring diagram for the head unit you have the splice in accordingly. This Metra harness is just an extra step, but it will give you more wire length to work with if you're short on length with what you have.